Full Stack Engineer (£120k-£135k + Equity) at $2.3M seed-funded AI cybersecurity startup

Job Title

Full Stack Engineer

Salary

£120k-£135k + Equity

Company Description

$2.3M seed-funded AI cybersecurity startup transforming vulnerability management

Job Description

You will join as a core engineer building an AI engine that prioritizes critical security threats. Working alongside a founder from HackerOne, you will bridge the gap between automated scanning and real-world attacker logic, developing sophisticated ML pipelines and agentic AI features to help organizations defend themselves at scale.

Location

London, UK

Why this role is remarkable

• Work directly with a founder who led Hacker R&D at HackerOne and managed programs for the UK Ministry of Defence and FTSE 100 companies.
• Massive ownership in a small team of 6, backed by 6 Degrees Capital and advisors from DeepMind, Cisco, and 1Password.
• Opportunity to shape an AI-native product in a $17B+ market, moving beyond simple API wrappers to genuine model training and evaluation.

What You Will Do

• Build and maintain full-stack features using a Python/Prefect backend and React frontend, handling everything from authorization to production debugging.
• Own the ML lifecycle, including training models, building evaluation pipelines, and shipping agentic AI features to automate vulnerability analysis.
• Collaborate directly with customers to identify pain points, rapidly prototype solutions, and ship impactful security tools in a fast-paced environment.

The ideal candidate

• Has 2-6 years of professional engineering experience with strong Python fundamentals and a proven track record of shipping production software.
• Possesses genuine depth in Machine Learning, understanding model training and evaluation techniques rather than just consuming third-party APIs.
• Exhibits a growth mindset and curiosity, thriving in high-autonomy startup environments and valuing engineering craft over rigid processes.

#J-18808-Ljbffr…